diff --git a/postfix/conf/main.cf b/postfix/conf/main.cf
index 8a986931..26926dc9 100644
--- a/postfix/conf/main.cf
+++ b/postfix/conf/main.cf
@@ -23,6 +23,7 @@ smtpd_tls_cert_file=/certs/cert.pem
 smtpd_tls_key_file=/certs/key.pem
 smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+smtp_tls_security_level = may
 
 ###############
 # SASL